(cyproterone acetate) n. a steroid drug that inhibits the effects of male sex hormones (see anti-androgen). It is used to treat hypersexuality disorders and advanced prostate cancer in men; combined with ethinylestradiol as co-cyprindiol, it is used to treat acne and hirsutism in women. Common side-effects include tiredness, loss of strength, inhibition of sperm formation, infertility, and breast enlargement (gynaecomastia). Because of a risk of liver damage, liver function tests should be carried out before and during treatment.
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